NCIDQ Materials, Finishes, and Specifications 2 — Questions and Answers
Question 1: What does STC (Sound Transmission Class) measure in wall assemblies?
- Airborne sound isolation between spaces (Correct answer)
- Impact noise from footsteps above
- Reverberation time within a room
- Thermal conductivity through the assembly
Correct answer: Airborne sound isolation between spaces
STC rates how well a wall, floor, or ceiling assembly blocks airborne sound transmission; higher STC values indicate better sound isolation.
Question 2: Which material standard applies to hardwood veneer plywood used in casework and millwork?
- HPVA HP-1 (Hardwood Plywood and Veneer Association) (Correct answer)
- ASTM C1185
- ANSI A208.1
- AWI Quality Standards Section 100
Correct answer: HPVA HP-1 (Hardwood Plywood and Veneer Association)
HPVA HP-1 is the industry standard for hardwood and decorative plywood, covering veneer grades, core types, and tolerances used in architectural millwork.
Question 3: What is the primary difference between porcelain and ceramic tile from a specification standpoint?
- Porcelain has lower water absorption (≤0.5%) and greater density (Correct answer)
- Ceramic is harder and more frost-resistant
- Porcelain is always unglazed; ceramic is always glazed
- Ceramic has a higher COF rating
Correct answer: Porcelain has lower water absorption (≤0.5%) and greater density
Porcelain tile is fired at higher temperatures, producing a denser body with water absorption of ≤0.5%, making it more durable and suitable for exterior or wet applications.
Question 4: In a finish schedule, what does 'PT-1' typically represent?
- A paint type and color designation (Correct answer)
- A porcelain tile product number
- A wood stain protection formula
- A performance test classification
Correct answer: A paint type and color designation
In a finish schedule, designations like PT-1 identify specific paint specifications including sheen level, color, and manufacturer for application to defined surfaces.
Question 5: Which resilient flooring type consists of a photographic layer protected by a clear urethane wear layer?
- Luxury Vinyl Tile/Plank (LVT/LVP) (Correct answer)
- Sheet vinyl (homogeneous)
- Linoleum
- Rubber tile
Correct answer: Luxury Vinyl Tile/Plank (LVT/LVP)
LVT/LVP uses a photographic film layer under a urethane wear layer to simulate wood, stone, or tile patterns with high dimensional stability.
Question 6: What does 'FSC certified' mean when specifying wood products?
- The wood comes from responsibly managed forests certified by the Forest Stewardship Council (Correct answer)
- The wood has been fire-stop treated per code
- The wood is finished with a fluorosurfactant coating
- The wood passed structural stress testing
Correct answer: The wood comes from responsibly managed forests certified by the Forest Stewardship Council
FSC (Forest Stewardship Council) certification verifies that wood products were sourced from forests managed to environmental and social standards, supporting LEED credits.
NCIDQ Materials, Finishes, and Specifications 2
What does STC (Sound Transmission Class) measure in wall assemblies?